Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bc93915137da88a8bb2ae23ea449b61f1c0dacf7499ebc414eacd4e50c64e8b8' 
  AND token = 'P4/gkXxy2k4x8uuSFQlGq0uxOp5JZlM+mlZZUPLs7ZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}